In this classic episode of Stuff to Blow Your Mind, Julie and Robert continue their discussion of the overlap between shamanism and cognitive neuroscience. In particular, what sort of hallucinatory experiences do substances like DMT, psilocybin and salvia grant users? Why do humans have trace elements of DMT in their bodies? All these questions and more will be discussed.

A shaman consumes a psychedelic mushroom and visits the spirit world. Meanwhile, a scientist studies the effects of psilocybin on depression and conceptions of self. In this episode, Robert and Julie discuss the common ground shared by these disciplines in this classic episode of Stuff to Blow Your Mind.

There's something intoxicating about the notion of a lost continent. Imagine an entire landscape - perhaps even an entire civilization untouched by Western colonialism or perhaps lost beneath ancient, cataclysmic waves. But lost continents are far from mere whimsy and fictional fancy. Amid the dreams and occult whispers, reason and science emerge to dazzle the imagination.

Belief in Hell is problematic at best. How do we relate to our fellow human beings while sorting them into an imagined afterlife of torment? How do we relate to faiths and myths that heap such additional darkness on an already bleak world? In this episode of Stuff to Blow Your Mind, Robert and Julie discuss the origins of belief in Hell, the philosophical problems it entails and just what sociologists and economists think about its effects on the real world.

The mythical centaur represented man's dual nature -- and as one biologist points out, the creature would also need two hearts. In this episode, Robert and Julie discuss all things centaur, from the creature's symbolic meaning to its fictional anatomy.